EDIT : You can enable RaceMenuMorphsCBBE.esp from BodySlide and Outfit Studio - [CBBE Studio] in MO (under optional plugins) and place it after RaceMenuPlugin.esp .This will allow you to go wild in character creation and basically shape the body any way you want.

Just make sure to set AlignHeapAllocate=1in X:\Skyrim\Data\skse\plugins\CrashFixPlugin.ini when you edit your character or the game will crash when using the morphs.

; Result: Fixes these type of crashes. Some people report longer loading times and higher memory usage with this enabled!; Update: Disabled by default since it's incompatible with some ENB settings, higher memory usage and longer loading times.; It's safe and probably good to enable if you are ok with those downsides.